宽带小型化无线收发系统的设计
发布时间：2019-01-09 06:00
【摘要】：无论是在民用还是军用的领域,多普勒测速系统都得到了非常广泛的研究以及应用。在民用领域可以监测汽车行驶速度,避免交通事故的发生;可以引导民航飞机安全着陆,保证旅客的安全。在军用领域可以监测敌机的飞行速度,及时进行预警;还可以用于武器制导,精确的摧毁目标等。而随着科技的进步,现代通信系统快速发展,越来越多的领域需要进行无线通信,现有的频率资源已经越来越紧迫,射频信道也就越来越珍贵。在通信频率无法大规模扩宽的情况下,如何能有效的利用现有的射频信道就成了一个重要的课题。因此,对宽带小型化无线收发系统的研制,具有重要的意义。本文研究了一款两次变频的宽带小型化无线收发系统。这个系统具有小步进、大动态范围等特点。它的接收机接收频率覆盖2GHz~3GHz,输出中心频率140MHz;同时发射机输入频率为140MHz,输出频率为2GHz~3GHz。本文采用了两次变频的结构,有效地抑制了镜像频率,保证了输出信号的纯净;通过对低噪声放大器的设计,保证了整体噪声达标。本文的难点之一是实现0.0001Hz的小步进。在比较各种小步进的方案后,以小型化为准则,对现有的方案进行改进,最终利用“锁相环+直接数字频率合成器+分频器”实现了这个功能。此外,接收动态范围也是本文的另一个难点。利用级联自动增益放大器的方式,改变传统的反馈方式,解决了级联自动增益放大器常常不能锁定的问题。
[Abstract]:Doppler velocimetry systems have been widely studied and applied in both civil and military fields. In the field of civil use, it can monitor the speed of vehicles, avoid traffic accidents, guide civil aviation aircraft to land safely and ensure the safety of passengers. In the military field, it can monitor the flying speed of the enemy aircraft and carry out early warning in time, and can also be used for weapon guidance, accurate destruction of targets, and so on. With the development of science and technology, the rapid development of modern communication systems, more and more fields need to carry out wireless communications, the existing frequency resources have become more and more urgent, the radio frequency channel is becoming more and more valuable. How to utilize the existing RF channel effectively becomes an important problem when the communication frequency can not be broadened on a large scale. Therefore, it is of great significance for the development of wideband miniaturized wireless transceiver system. In this paper, a two-frequency conversion wideband miniaturized wireless transceiver system is studied. This system has the characteristics of small step, large dynamic range and so on. It has a receiver receiving frequency of 2 GHz, output center frequency of 140 MHz, and transmitter input frequency of 140 MHz and output frequency of 2 GHz / 3 GHz. In this paper, the structure of twice frequency conversion is adopted, which can effectively restrain the mirror frequency and ensure the purity of the output signal, and the overall noise standard is ensured by the design of the low noise amplifier. One of the difficulties of this paper is to realize the small step of 0.0001Hz. After comparing various small step schemes, the existing scheme is improved according to the principle of miniaturization. Finally, this function is realized by using the phase-locked loop direct digital synthesizer divider. In addition, the dynamic range of reception is another difficulty in this paper. The traditional feedback method is changed by using the cascade automatic gain amplifier, which solves the problem that the cascade automatic gain amplifier is often unable to lock.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN859
本文编号：2405225
[Abstract]:Doppler velocimetry systems have been widely studied and applied in both civil and military fields. In the field of civil use, it can monitor the speed of vehicles, avoid traffic accidents, guide civil aviation aircraft to land safely and ensure the safety of passengers. In the military field, it can monitor the flying speed of the enemy aircraft and carry out early warning in time, and can also be used for weapon guidance, accurate destruction of targets, and so on. With the development of science and technology, the rapid development of modern communication systems, more and more fields need to carry out wireless communications, the existing frequency resources have become more and more urgent, the radio frequency channel is becoming more and more valuable. How to utilize the existing RF channel effectively becomes an important problem when the communication frequency can not be broadened on a large scale. Therefore, it is of great significance for the development of wideband miniaturized wireless transceiver system. In this paper, a two-frequency conversion wideband miniaturized wireless transceiver system is studied. This system has the characteristics of small step, large dynamic range and so on. It has a receiver receiving frequency of 2 GHz, output center frequency of 140 MHz, and transmitter input frequency of 140 MHz and output frequency of 2 GHz / 3 GHz. In this paper, the structure of twice frequency conversion is adopted, which can effectively restrain the mirror frequency and ensure the purity of the output signal, and the overall noise standard is ensured by the design of the low noise amplifier. One of the difficulties of this paper is to realize the small step of 0.0001Hz. After comparing various small step schemes, the existing scheme is improved according to the principle of miniaturization. Finally, this function is realized by using the phase-locked loop direct digital synthesizer divider. In addition, the dynamic range of reception is another difficulty in this paper. The traditional feedback method is changed by using the cascade automatic gain amplifier, which solves the problem that the cascade automatic gain amplifier is often unable to lock.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN859
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